SHA Generator

SHA — Secure Hash Algorithm — is a family of cryptographic hash functions standardized by NIST and used extensively across security infrastructure. SHA Generator supports the major variants in the family, letting you produce SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text input.

SHA-256 is the workhorse of modern cryptography. It's the algorithm behind Bitcoin's proof-of-work, TLS certificate signatures, JWT token signing, and countless API authentication schemes. When an API documentation page says "sign your request using HMAC-SHA256," this is the underlying hash function. When code review comments call for replacing an MD5 checksum with something more secure, SHA-256 is usually the recommendation.

SHA-512 produces a longer output — 128 hexadecimal characters versus 64 for SHA-256 — providing a larger margin against brute-force attacks, at the cost of slightly more computation. For most web applications, SHA-256 is sufficient. For applications handling particularly sensitive data or with long security horizons, SHA-512 is the safer choice.

SHA-1 is included primarily for compatibility with legacy systems. It is no longer considered secure for cryptographic purposes — collision attacks have been demonstrated practically — and should not be used in new applications for security-sensitive functions. It persists in git commit hashing and some older protocols where the threat model doesn't require collision resistance.

The tool covers all common use cases: generating hashes for manual verification, testing hash-based comparison logic, understanding what a particular hash function produces, and generating test vectors for cryptographic implementations.